Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alibaba
BABA
|
+$50.3M |
| 2 |
Boeing
BA
|
+$24.3M |
| 3 |
SPDR Gold Trust
GLD
|
+$18.3M |
| 4 |
Biogen
BIIB
|
+$15.9M |
| 5 |
FedEx
FDX
|
+$15.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$60.3M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$36.4M |
| 3 |
Netflix
NFLX
|
+$19M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$17.3M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$14.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 0.49% |
| 2 | Technology | 0.48% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.35% |
| 5 | Communication Services | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3076
CALL
Worthington Enterprises
WOR
$2.79B
| $328K | ﹤0.01% |
148
+23
| +18% | +$533 |
|
|
MRTX
3077
DELISTED
Mirati Therapeutics, Inc. Common Stock
MRTX
| $328K | ﹤0.01% |
4,215
-19,860
| -82% | -$1.86M |
|
3078
Nokia
NOK
$51.8B
| $327K | ﹤0.01% |
64,667
-83,914
| -56% | -$433K |
|
3079
PUT
Xencor
XNCR
$1.47B
| $327K | ﹤0.01% |
97
+1
| +1% | +$40 |
|
3080
CALL
Landstar System
LSTR
$6.5B
| $326K | ﹤0.01% |
29
+25
| +625% | +$2.75K |
|
3081
Deckers Outdoor
DECK
$13.3B
| $325K | ﹤0.01% |
13,254
-21,642
| -62% | -$554K |
|
3082
Evolent Health
EVH
$429M
| $325K | ﹤0.01% |
45,265
+43,172
| +2,063% | +$310K |
|
3083
FS KKR Capital
FSK
$3.04B
| $325K | ﹤0.01% |
+13,970
| New | +$328K |
|
3084
CALL
Global Net Lease
GNL
$1.87B
| $325K | ﹤0.01% |
167
-50
| -23% | -$974 |
|
3085
CALL
Renasant Corp
RNST
$4B
| $325K | ﹤0.01% |
93
+18
| +24% | +$618 |
|
3086
PUT
Virtu Financial
VIRT
$5.12B
| $325K | ﹤0.01% |
199
+100
| +101% | +$2K |
|
|
VGR
3087
CALL
DELISTED
Vector Group Ltd.
VGR
| $325K | ﹤0.01% |
369
+92
| +33% | +$705 |
|
3088
Alcon
ALC
$32.8B
| $324K | ﹤0.01% |
5,575
+1,553
| +39% | +$93.2K |
|
3089
PUT
Mercury Systems
MRCY
$6.23B
| $324K | ﹤0.01% |
40
+20
| +100% | +$1.58K |
|
3090
Cloudflare
NET
$94.3B
| $324K | ﹤0.01% |
+17,472
| New | +$338K |
|
3091
Post Holdings
POST
$4.14B
| $324K | ﹤0.01% |
4,689
-185
| -4% | -$12.6K |
|
|
PS
3092
PUT
DELISTED
Pluralsight, Inc. Class A Common Stock
PS
| $324K | ﹤0.01% |
193
+83
| +75% | +$1.79K |
|
3093
PUT
Applied Optoelectronics
AAOI
$7.85B
| $323K | ﹤0.01% |
288
-191
| -40% | -$1.92K |
|
3094
CALL
Brink's
BCO
$4.86B
| $323K | ﹤0.01% |
39
+5
| +15% | +$417 |
|
3095
Everest Group
EG
$15.4B
| $323K | ﹤0.01% |
+1,215
| New | +$307K |
|
|
IAA
3096
DELISTED
IAA, Inc. Common Stock
IAA
| $323K | ﹤0.01% |
+7,748
| New | +$349K |
|
|
CLGX
3097
CALL
DELISTED
Corelogic, Inc.
CLGX
| $323K | ﹤0.01% |
70
-183
| -72% | -$8.41K |
|
3098
PDF Solutions
PDFS
$2B
| $322K | ﹤0.01% |
24,710
-7,313
| -23% | -$92.3K |
|
3099
Black Stone Minerals
BSM
$3.17B
| $321K | ﹤0.01% |
22,559
+7,122
| +46% | +$104K |
|
3100
CALL
Compass Minerals
CMP
$1.25B
| $321K | ﹤0.01% |
57
+1
| +2% | +$54 |
|
Similar funds
Simplex Trading's Q3 2019 Portfolio in Review
As of Q3 2019, Simplex Trading held 8,410 positions worth $35.2B, down 4.1% from $36.6B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading's Q3 2019 filing shows 1,312 new, 3,129 increased, 2,596 reduced and 1,163 closed positions. Its largest new stake was SPDR Gold Trust: 131,281 shares worth $18.2M. The largest sale was Alphabet (Google) Class C, an estimated $60.3M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 0.49% of assets, up from 0.26% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q3 2019 buy was SPDR Gold Trust: 131,281 shares worth $18.2M.
- Simplex Trading added most to Alibaba in Q3 2019, an estimated $50.3M increase.
- Simplex Trading's biggest Q3 2019 reduction was Alphabet (Google) Class C, cutting an estimated $60.3M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q3 2019, selling an estimated $36.4M.
- Simplex Trading's ten largest holdings make up 33% of its $35.2B portfolio in Q3 2019.
- Simplex Trading opened 1,312 new positions and closed 1,163 in Q3 2019.
- Simplex Trading's portfolio value fell 4.1% quarter-over-quarter to $35.2B.
Based on Simplex Trading's 13F filing for Q3 2019, filed 15 Oct 2019.